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TPS22996EVM: Pull down resistors missing on ON1 and ON2 inputs.

Thomas Bodemann
Prodigy 30 points
Part Number: TPS22996EVM
Other Parts Discussed in Thread: TPS22996,

Tool/software:

The TPS22996EVM is missing pull-down resistors on the ON1 and ON2 inputs on the TPS22996 device. Once enabled with one of the DIP switches (SW1 or SW2) the given output will stay ON even when the DIP switch is turned completely off. A high value pull down resistor will solve this issue. Even the datasheet states that the ON inputs must no be left floating. 

  • 0
    TI__Mastermind 38335 points

    Hi Thomas,

    It looks like EVM was designed with the assumption that ON pin will be driven to high or low all the time so do not require a pull up or pull down resistor. Are you pulling up the ON pin using the main power supply or a MCU? You have J8 and J9 jumper to decide from where you want to pull the ON pin. 

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 30 points

    It's a general comment to the design of the eval kit. There is no easy way to drive the ON inputs low, unless you solder on the board or do some strange jumping. 
    I don't agree that the EVM was design with the assumption that ON pin will be constantly driven high, because there would be no point i having different resistances in series (R1-R8) to be able to test different slew rates. 

    You are right that if you use i.e. a MCU you can drive high/low directly from J4 and and jump J8 and J9 accordingly.